SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e6dab7ec1b0c76e114e559f8b00642f487de92b880202f93331a25b2173eee4' 
  AND token = 'fb9ols/Hx9VKETBQYFFvVh+3j9D6mJQoJbLwsHSgY5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}